styling and the potential for speed were praised, the cramped interior, stubby rear end, and lack of boot space were not. BRM test driver Ken Richardson was invited to drive the car; his low opinion of the car's handling and driveability resulted in him being hired to the development team for its replacement. Production TRs TR2 and TR3 The redesign and development of the 20TS led to a longer, roomier car with a larger boot, built on an all-new frame with revised suspension and brakes and an uprated engine. The resulting Triumph TR2 was shown in March 1953 at the Geneva Motor Show. The TR2 would form the basis of the evolution of the TR line up to the TR6. The TR3, introduced in 1955, had a front grille and a more powerful engine. In October 1956, the front brakes of the TR3 were changed from 10 in drums to 11 in discs. The TR3 was restyled in 1957 and was available with a larger 2.2 litre; engine; the restyled car was unofficially known as the TR3A. A further development, with the larger engine as standard and with a fully synchromesh gearbox, was made available in 1962, the final year of TR3 production. This last version of the TR3 was unofficially known as the TR3B. TR4, TR4A, TR5, TR250, and TR6 Introduced in 1961, the TR4 had a completely new body designed by Giovanni Michelotti. The TR4 was upgraded to the TR4A in 1965 with the addition of independent rear suspension. In 1967, the TR line was updated with servo-assisted brakes and a 2.5 L version of the straight-six engine that had been used in the Triumph 2000. Two different models were made: the TR250 with two Stromberg carburettors for the US market, and the TR5 with Lucas fuel injection for the rest of the world. Both the TR250 and the TR5 were replaced by the TR6 in 1968, with the US version continuing with carburettors. The main difference between the TR6 and the TR5 it replaced was its styling. The front and rear ends of the car had been restyled by German coachbuilder Karmann, giving the car a more contemporary appearance. An anti-roll bar was added to the front suspension as well. TR7 and TR8 The Triumph TR7 was introduced in 1974. While all previous TRs were evolutionary designs developed from the TR2, the TR7 was an all-new design